Strap for Promaster Dive "Ecozilla"

The Citizen ProMaster BJ8050-08E features a lug width of 29 millimetres. This dimension is determined by the specific lug width of the 48 mm case. To verify strap compatibility, measure the distance between the inner edges of the lugs perpendicular to the lug bar: it should read 29 mm. Also check the lug thickness (typically between 3 and 5 mm) to ensure proper seating of the strap in the lug slot.

The BJ8050-08E, being a technical and robust timepiece, pairs excellently with vegetable-tanned leather straps (alligator or calf), which convey elegance without compromising the model's professional character. For more aggressive applications, NATO straps in thick cotton or canvas offer water resistance and extreme durability. For daily practicality, rubber represents the optimal choice: hypoallergenic, resistant to chemicals, and comfortable in hot, humid climates.

To change the strap, remove the pins or barrels securing the strap to the case lugs. Use a dedicated tool such as a spring bar tool to access the elastic pins housed within the lugs. Position the tool in the designated groove, applying gentle pressure to release the pin. Remove the old strap and insert the new one, aligning the holes with the pins. Once in place, the pin will reposition itself automatically thanks to the elastic spring.

Yes, the Citizen ProMaster BJ8050-08E is fully compatible with quality aftermarket 29 mm straps, provided they respect both the lug width (29 mm) and thickness (typically 3–5 mm). Many specialised manufacturers, such as MilanoStraps, produce bespoke straps in this size in leather, NATO, and rubber. Before purchase, always verify technical specifications supplied by the seller to ensure precise compatibility.

The lifespan of a leather strap depends on tanning method, usage patterns, and maintenance. A quality vegetable-tanned leather strap may last 3 to 8 years under normal wear conditions. Factors that shorten longevity include constant water exposure, frequent perspiration, and lack of maintenance. To extend strap life, dry it regularly if wetted, avoid prolonged direct sunlight, and occasionally apply a nourishing balm. Over time, the leather will naturally develop patina and colour variations—desirable characteristics that mark the passage of time and the watch's history of use.